韩城北区煤层结构的测井响应特征

Well Logging Response of Coal Seam Structure in Hancheng North Area

韩城地区煤层受多期构造破坏,煤体结构复杂,煤层气井出粉较为严重,目前对区内煤体结构分布规律研究尚且不足,制约了区内煤层气产能提高。依据对韩城地区测井资料与岩心样品资料的对比分析,总结出北区不同煤体结构的纵波时差测井特征,结合深浅侧向电阻率测井、双井径测井及密度测井曲线组合特征,对该区煤体结构进行识别及分层定厚。通过对研究区25口煤层气井测井资料的分析,揭示了3号和11号煤层煤体结构空间分布规律:3号与11号煤层的煤体结构在空间上的展布规律基本相似,区内中东部有小面积的Ⅰ类结构分布,其余大部分面积为Ⅱ、Ⅲ类结构分布区;区内的东南部及西北部以Ⅲ、Ⅳ类结构为主。

Coal seams in the Hancheng area have experienced multi-staged tectonic churning,caused coal mass structurally complex,and serious CBM well coal pulverized. At present,the study on distribution pattern of coal mass structure is insufficient in the area,thus restricted CBM production capacity improvement. Based on contractive analysis of well logging data and rock core sample data from Hancheng area,summed up compressional wave moveout well logging features of different coal mass structures in Hancheng north area,combined with assemblage features of deep and shallow laterolog resistivity logging,dual-diameter logging and density logging traces,have carried out identification of coal mass structure in the area and layering thickness confirmation. Through well logging data analysis of 25 CBM wells in the area,revealed coal mass structure spatial distribution patterns of coal Nos. 3 and 11 are basically similar. In the area＇s mid-east part has small area of category I structures distributed,most of the rest are categories II and III; in southeast and northwest parts of the area are mainly categories III and IV.